Force-pump



(No Model.)

T. W. BAMES.

Force Pump.

No. 241,335. Patented May 10,1881.

N PETERS. Phot o ljthognph r. Washington, D C.

UNTTED STATES PATENT OFFICE.

FREDERICK W. EAMES, OF \VATERTOIVN, NEW YORK.

FORCE-PUMP.

SPECIFICATION forming part of Letters Patent No. 241,335, dated May 10, 1881.

Application filed October 29, 1880.

To all whom it may concern:

Be it known that I, FREDERICK W. EAMES, a citizen of the United States, residing at Watertowu,in the county ot'Jefferson and State ot'New York, haveinvented certain new and useful Improvementsin Force-Pumps, (Case 1.1;) and I do hereby declare the following to be a full, clear, and exact description of theinvemiomsuch as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification, the same having been patented to me by the government of Great Britain by Letters Patent No. 616, dated February 15, 187 9.

My present invention relates to force-pumps for compressing air or other compressible fluids.

For these purposes my invention consists in the arrangement of two or more air-compressing pistons or equivalents of different comparative diameters or capacities, with pipe and valve connections, in such a manner that the pistons will force the fluid directly into the pipes orreservoirsintended to be charged until the pressure has reached a certain degree, and which degree is regulated by a valve in the pipe-connections, whereupon direct communication of the larger cylinder with the pipes or reservoirs will be automatically cut oil, and said larger cylinder will then pump into the smaller cylinder,where the air will be still further compressed to brin git up to the required pressure for charging the pipes and reservoirs.

Figure 1 represents a central vertical sectional view of two pistons of different diameters, to which my present improvements have been applied; and Fig. 2 shows a modification thereof, in which the cylinders are difi'erently arranged, and are operated by a direct connection with the opposite sides of a piston in a steam-cylinder.

To enable others skilled in the art to make and use my invention, I will now point out in detail methods by which my invention may be carried into effect, here premising that the invention was designed more particularly for use in compressing air, i11 connection with a system of brake apparatus for railroad-trains operated by compressed air; but I do not wish it understood that my present improvement is limited in its use in connection with such sys- (No model.) Patented in England February 15, 1879.

tem of brake apparatus, as my invention is capable of a great variety of uses, or where, for any purpose, it is desired to pump, force, or compress any fluid. it will here, however, be described in connection with a compressedair system of brakes for railroad-trains.

A. A represent two cylinders of ditferent diameters and capacities. In Fig. 1 they are represented secured to a frame or bed, D, and arranged at an angle of ninety degrees. The frame-bed l) is provided with an extension-support for receiving thejournal of the crank (l, to which are secured the piston-rods c c of the cyl inders A A. The inner ends of the cylinders are open. The head of the outer end of the larger cylinder A is provided with two openings, d and e, the former provided with an inwardly-opening valve, d, and the latter with an outwardly-opening valve, 0. The outer head of the smaller cylinder A has three openings-a central opening provided with an outwardly-opening valve, b and communicating with pipe I), which,in turn, opens into brakepipe E. The cylinder A is also provided with two other openings, f g, each provided with an inwardly-opening valve. PipeB connects cylinders A A, and which forms a virtual extension of the brake-pipe E. Pipe B connects with cylinder A through opening 0, and with cylinder A through pipes g and b. At the junction where the pipe B joins the brakepipe E a ligh tly-weighted valve, a, is fitted, and at its junction with pipe {1, leading to cylinder A, it is provided with a valve, b,which is weighted by a spring, so as to yield only to a much greater pressure than valve a.

In the modification shown by Fig. 2 the construction and mode of operation are substantially the same; but the cylinders are arranged opposite each other and their pistonrods work in the same horizontal plane. They are, however, connected directly with the opposite sides of the piston of a steam-cylinder, and are operated thereby.

The operation is as follows:- At the commencement of their action both pumps or cylinders-A A take their air, respectively, through openings at and f, and discharge the same directly into the brake-pipe E through pipes B and b, by means of the valvular apparatus shown and described. This state of things will continue, and the pistons will rapidly compress the air to the degree of pressure at which the valve b. located in the pipe g, is set or weighted. The back-pressure will then close the valve a and turn the discharge of the cylinder A into cylinder A, through the pipe 9 and its valve 1), where the air will be still further compressed to bring it up to the required pressure for applying the brakes. The compressed air received-an d discharged from pump A passes through pipe 1; to the brake-pipe E and reservoirs. The pistons of the cylinders A A are driven by the reciprocating crank (l, the cylinders being set at an angle to each other, as before described.

hat I claim as new is 1. Two cylinders arranged with respect to each other so that each will operate independently of the other until a certain degree of pressure is obtained, whereu 'mn the larger cylinder will pump into the smaller, which, in turn, will discharge into the pipe or vessel intended to be filled, substantially as set forth.

2. Two cylinders arranged with respect to each other so that each will operate i ndependently of the other until a certain degree of pressure is obtained, whereupon the larger cylinder will pump into the smaller by an automatic arrangement of valvular apparatus, and which, in turn, will discharge into the pipe or vessel intended to be filled, substantially as set forth.

3. In combination with the cylinders A A,

the pipes E, g, and I), provided with the valvular devices, substantially as described, whereby each cylinder will operate independently of the other until a limited amount of pressure is obtained.

4. In combination with pipe E, the pumps A A and the pipes B, g, and I), provided with the valvular devices, substantially as described, whereby each cylinder will operate independently of the other until a limited amount of pressure is obtained.

5. In combination with two pumps and pistons, A A, arranged upon the opposite sides of a steam -cylinder and operated directly thereby, the pipes B, y, and b, provided with the valvular apparatus, substantially as described.

6. In eombination with cylinder A, having opening (1 and valve d, and opening 0 and valve 0, the cylinder A, having three openings, two of which, f and g, are provided with iiiwardly-opening valves, and the other, 0', with an ontwardly-opening valve, [1 and pipes B, 9, and I), provided with valves a and 1), substantially as described.

In testimony whereof I have aflixed my signature in presence of two Witnesses.

FRED. W. EAMES.

\Vitnesses CHAS. 1). BINGHAM, E. D. EAMES. 

